Sean Clouston, professor in the Program of Public Health and the Department of Family, Population, and Preventive Medicine at Stony Brook, joins Newsline with Brigitte Quinn to discuss a study he led that shows the mental health impact of 9/11 on first responders.

PHOTO: FDNY Firefighter Gerard McGibbon, of Engine 283 in Brownsville, Brooklyn, prays after the 9/11 attacks. (Mario Tama/Getty Images)